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=> 3x - 2p = 3x^2 - 6
=> 0 = 3x^2 - 3x + 2p - 6
a = 3, b = -3, c = 2p - 6
(x1)^2 + (x2)^2 = (x1 + x2)^2 - 2x1.x2
= (-b/a)^2 - 2(c/a)
= (-(-3)/3)^2 - 2(2p - 6)/3
= 1 - 2(2p/3 - 2)
= 1 - 4p/3 + 4
= 5 - 4p/3
= (15 - 4p)/3